package com.liu.interceptors;

import com.liu.utils.JwtUtil;
import com.liu.utils.ThreadLocalUtil;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import java.util.Map;

@Component
public class LoginInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//        令牌验证
        String token = request.getHeader("Authorization");
        try {
            Map<String, Object> claims = JwtUtil.parseToken(token);
//            将业务数据存储到ThreadLocal中。
            ThreadLocalUtil.set(claims);
//            令牌验证成功，拦截器放行。
            return true;
        } catch (Exception e) {
//            令牌验证失败，设置状态码（401），拦截器不放行。
            response.setStatus(401);
            return false;
        }
    }

//    重写afterCompletion方法，在请求处理完成后执行线程数据清楚。


    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        ThreadLocalUtil.remove();
    }
}
